Hillary Clinton won big in Pennsylvania, but was it big enough to change the momentum of the campaign?  Even after her decisive ten-point victory last night over Barack Obama, why are most political analysts still giving her no more than 10% chance of winning the Democratic presidential nomination? Guest host Lawrence O'Donnell talks about when and how the super-delegates will have to intervene to pick a winner. Also, General David Petraeus is named head of Central Command, and how NAFTA has once again become a political football.